package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import lombok.extern.slf4j.Slf4j;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.apache.commons.lang3.StringUtils;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
@Slf4j
public class ReportServiceImpl implements ReportService {
    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WorkspaceService workspaceService;

    @Override
    public TurnoverReportVO turnoverStatistics(LocalDate begin, LocalDate end) {
        // 当前集合用于存放从begin到end范围内的每天的日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while(!begin.equals(end)){
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        String str = StringUtils.join(dateList, ",");

        List<Double> turnoverList = new ArrayList<>();
        for(LocalDate date : dateList){
            // 查询date日期对应的营业额数据：状态为“已完成”的订单金额合计
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Map map = new HashMap();
            map.put("begin", beginTime);
            map.put("end", endTime);
            map.put("status", Orders.COMPLETED);
            Double turnover = orderMapper.sumByMap(map);
            turnover = turnover == null ? 0.0 : turnover;
            turnoverList.add(turnover);
        }
        String str2 = StringUtils.join(turnoverList, ",");
        TurnoverReportVO turnoverReportVO = new TurnoverReportVO();
        turnoverReportVO.setDateList(str);
        turnoverReportVO.setTurnoverList(str2);
        return turnoverReportVO;
    }

    @Override
    public UserReportVO userStatistics(LocalDate begin, LocalDate end) {
        // 当前集合用于存放从begin到end范围内的每天的日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while(!begin.equals(end)){
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        String str = StringUtils.join(dateList, ",");

        List<Integer> newUserList = new ArrayList<>();
        List<Integer> totalUserList = new ArrayList<>();

        for(LocalDate date: dateList){
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Map map = new HashMap();
            map.put("end", endTime);
            Integer totalUser = userMapper.countByMap(map);
            totalUserList.add(totalUser);
            map.put("begin", beginTime);
            Integer newUser = userMapper.countByMap(map);
            newUserList.add(newUser);
        }
        String str1 = StringUtils.join(newUserList, ",");
        String str2 = StringUtils.join(totalUserList, ",");
        UserReportVO userReportVO = new UserReportVO();
        userReportVO.setDateList(str);
        userReportVO.setTotalUserList(str2);
        userReportVO.setNewUserList(str1);
        return userReportVO;
    }

    @Override
    public OrderReportVO orderStatistics(LocalDate begin, LocalDate end) {
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while(!begin.equals(end)){
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        String str = StringUtils.join(dateList, ",");

        List<Integer> orderCountList = new ArrayList<>();
        List<Integer> validorderCountList = new ArrayList<>();
        for(LocalDate date: dateList){
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            // 查询每天的订单总数和有效订单数
            Integer orderCount = getOrderCount(beginTime,endTime,null);
            Integer validorderCount = getOrderCount(beginTime,endTime,Orders.COMPLETED);
            orderCountList.add(orderCount);
            validorderCountList.add(validorderCount);
        }
        String str1 = StringUtils.join(orderCountList, ",");
        String str2 = StringUtils.join(validorderCountList, ",");

        Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();
        Integer totalvalidOrderCount = validorderCountList.stream().reduce(Integer::sum).get();
        Double orderCompletionRate = 0.0;
        if(totalOrderCount > 0){
            orderCompletionRate = totalvalidOrderCount.doubleValue()/ totalOrderCount;
        }
        OrderReportVO orderReportVO = OrderReportVO.builder()
                .dateList(str)
                .orderCountList(str1)
                .totalOrderCount(totalOrderCount)
                .validOrderCountList(str2)
                .validOrderCount(totalvalidOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
        return orderReportVO;
    }

    @Override
    public SalesTop10ReportVO salesTop10(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);
        List<GoodsSalesDTO> salesTop10 = orderMapper.getSalesTop10(beginTime, endTime);
        List<String> names = salesTop10.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        String nameList = StringUtils.join(names, ",");
        List<Integer> numbers = salesTop10.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());
        String numberList = StringUtils.join(numbers, ",");
        SalesTop10ReportVO salesTop10ReportVO = new SalesTop10ReportVO();
        salesTop10ReportVO.setNameList(nameList);
        salesTop10ReportVO.setNumberList(numberList);
        return salesTop10ReportVO;
    }

    @Override
    public void exportBusinessData(HttpServletResponse response) {
        // 1. 查询数据库，获取营业数据
        LocalDate datebegin = LocalDate.now().minusDays(30);
        LocalDate dateend = LocalDate.now().minusDays(1);
        LocalDateTime begin = LocalDateTime.of(datebegin, LocalTime.MIN);
        LocalDateTime end = LocalDateTime.of(dateend, LocalTime.MAX);
        // 查询概览数据
        BusinessDataVO businessDataVO = workspaceService.getBusinessData(begin, end);

        // 2. 通过POI将数据写入到Excel文件中
        InputStream in = this.getClass().getClassLoader().getResourceAsStream("template/datatemplate.xlsx");
        if (in == null) {
            throw new RuntimeException("找不到模板文件 template.xlsx");
        }
        try {
            // 基于模板文件创建一个新的excel文件
            XSSFWorkbook excel = new XSSFWorkbook(in);
            // 填充数据
            XSSFSheet sheet = excel.getSheetAt(0);
            sheet.getRow(1).getCell(1).setCellValue("时间："+datebegin+"至"+dateend);
            // 获取第四行
            XSSFRow row = sheet.getRow(3);
            row.getCell(2).setCellValue(businessDataVO.getTurnover());
            row.getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());
            row.getCell(6).setCellValue(businessDataVO.getNewUsers());
            // 第五行
            row = sheet.getRow(4);
            row.getCell(2).setCellValue(businessDataVO.getValidOrderCount());
            row.getCell(4).setCellValue(businessDataVO.getUnitPrice());

            // 填充明细数据
            for(int i = 0; i < 30; i++){
                LocalDate date = datebegin.plusDays(i);
                // 查询某一天的营业数据
                BusinessDataVO businessData = workspaceService.getBusinessData(LocalDateTime.of(date,LocalTime.MIN),
                                                                                LocalDateTime.of(date,LocalTime.MAX));
                row = sheet.getRow(7 + i);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessData.getTurnover());
                row.getCell(3).setCellValue(businessData.getValidOrderCount());
                row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessData.getUnitPrice());
                row.getCell(6).setCellValue(businessData.getNewUsers());
            }


            // 3.通过输出流将Excel文件下载到客户端浏览器
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);
            out.flush();
            out.close();
            excel.close();
        }catch (Exception e){
            e.printStackTrace();
        }



    }

    private Integer getOrderCount(LocalDateTime begin, LocalDateTime end, Integer status) {
        Map map = new HashMap();
        map.put("begin", begin);
        map.put("end", end);
        map.put("status", status);
        Integer x = orderMapper.countByMap(map);
        return x;
    }
}
